899. For there are two routes to the human understanding, namely the way through the senses, that is, the lower way, by which the human understanding is born, and there is the way through heaven from the Lord, which is the higher way. Whatever is born by the lower way is bodily and material, while what is born by the higher way is spiritual and heavenly. Unless the higher door is opened by the Lord, it can never be believed that such communication exists that one may see and be convinced. Yet from this source, there is conscience in many people. However, this conscience for the most part regards actions, and consists of a recognition of those things considered as matters of worship and duty; so it is not a true conscience, except faintly in some good people and spirits. But in angels it is clear, so that they know, perceive, understand that a thing is so, and that there is no life without that manifest conscience and conviction of realities, made manifest in various ways.